Well, it's in the smallest pocket inside my training bag and when something pushes the power button it turns on. You just have to press the power button down, there is no time interval at all between pressing it and the player turning on. And sometimes I turn it on accidentally when I put it on the table with the power button down. It's a very easy key to press down, and the audio book continues automatically even if I paused it before turning it off.
Right now I am only listening to short audio books. Because I don't want to use 10 minutes each day just searching for a chapter.